User's Manual

Brewster’s Angle Accessory Model No. OS-8170A
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3. Would Brewster’s Angle be larger or smaller for light in air reflecting off water?
The Brewster’s Angle would be smaller for light in air reflecting off water.
4. Would Brewster’s Angle be larger or smaller for light in water reflecting from the “D” Lens
(that is, if the “D” Lens were submerged in water)?
The Brewster’s Angle would be smaller for light in water reflecting from the “D” Lens.
5. How do polarized sunglasses reduce glare? Which direction is the axis of polarization in a pair
of polarized glasses? How would you check this?
Glare is polarized reflected light. Since glare is often reflected off horizontal surfaces
(such as water), the sunglasses are polarized vertically to extinguish the horizontally
polarized reflected light. To check this, you could text the sunglasses with the Analyzing
Polarizer since it has a known axis of polarization.
6. Which direction is the axis of polarization of the light reflected from the “D” Lens?
The axis of polarization of the light reflected off the “D” Lens is parallel to the surface,
which in this case is vertical.
7. How is the index of refraction affected by a change in the wavelength of the laser?
In general, the index of refraction increases as the frequency increases (wavelength
decreases).

p
tan
n
2
n
1
-----
1.33
1
----------

p
 53== =

p
tan
n
2
n
1
-----
1.50
1.33
----------

p
 48== =